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Kohashi, Akio; Onoe, Hironori; Yamamoto, Shinya*; Honda, Makoto*; Sakurai, Hideyuki*; Masumoto, Kiyoshi*
no journal, ,
no abstracts in English
Iwatsuki, Teruki
no journal, ,
Current status on research and development of drift backfilling technology in Mizunami Underground Research Laboratory was summarized.
Shibata, Kenji; Shimizu, Mayuko; Suzuki, Kazuhiro; Sueoka, Shigeru; Niwa, Masakazu
no journal, ,
The CHIME (Chemical Th-U-total Pb isochron method) dating has been performed on JEOL JXA-8530F FE-EPMA introduced in Tono Geoscience Center of Japan Atomic Energy Agency. Analysis of Pb on conventional spectrometers have disadvantage in count rate. JXA-8530F equipped with three R=100 provides significant shortening in analyzing time. Spectral interferences peculiar to R=100 mm spectrometers are found to be collected on the monazite analyses. The intrinsic responses of the R=100 mm counting systems with a PET crystal and a sealed Xe detector for PbM
are around ten times higher than that of the JCXA-733 counting systems. The measurement time required for a spot is ca. 35 minutes. The advanced procedure carried out 425
25 Ma for monazite from Cooma granite in southeastern Australia, which had dated by SHRIMP as 432.83.5 Ma. The CHIME monazite age of the Kojaku granite in southwestern Japan is 685 Ma that accords well with the LA-ICP-MS U-Pb zircon ages of 68.50.7 Ma.
Kato, Toshihiro; Iwatsuki, Teruki; Munemoto, Takashi; Kubota, Mitsuru; Hayashida, Kazuki; Nakata, Kotaro*; Hasegawa, Takuma*
no journal, ,
no abstracts in English
Sasao, Eiji; Yamada, Nobuto*; Suzuki, Keiichi*; Kuboshima, Koji*
no journal, ,
We performed investigation of fault with thick and clay-altered damaged zone in granitic rock used by cosmic ray muons at the Mizunami Underground Research Laboratory. Geology of investigated site consists of sedimentary sequence and underlying granite with unconformable contact at the 170 meters below ground level (G.L.). A fault with thick and clay-altered damaged zone is vertically distributed in granite. The muon telescopes were settled at the G.L.-200 and -300 meters to estimate densities of granite and fault. Densities of granite, fault and sedimentary rock are calculated as 3.38, 2.88 and 1.99 g/cm
, respectively. The obtained density is obviously higher than absolute value, though the reason of such difference is not clear at the moment. If the density of granite is assumed to be 2.6 g/cm, then the densities of fault and sedimentary rock are re-calculated as 2.2 and 1.5 g/cm. This result indicates that cosmic ray muons have good potential to detect geological structure.
Munemoto, Takashi; Iwatsuki, Teruki; Kato, Toshihiro; Kubota, Mitsuru; Hayashida, Kazuki
no journal, ,
no abstracts in English
Beppu, Shinji; Onoe, Hironori; Kohashi, Akio; Ueno, Tetsuro; Takayasu, Kentaro; Takeuchi, Ryuji; Ishibashi, Masayuki; Sawada, Atsushi
no journal, ,
no abstracts in English
Watanabe, Tsuyoshi; Okuyama, Satoshi; Asamori, Koichi
no journal, ,
no abstracts in English
Takeuchi, Ryuji; Iwatsuki, Teruki; Takayasu, Kentaro; Kawakubo, Masahiro*; Kobayashi, Masato*
no journal, ,
no abstracts in English
Kuwabara, Kazumichi; Ozaki, Yusuke; Matsui, Hiroya
no journal, ,
In the rock mechanical investigations at the Phase II, the research aims at "Characterization of geological environment in the Excavation Disturbed Zone (EDZ)" from the viewpoint of safety assessment. For the research, the specific information of the EDZ such as (1) size and structures, (2) petrophysical/geomechanical properties, and (3) stress state are required. The research also aims at "Characterization of geomechanical stability around tunnel" from the viewpoint of design and construction of underground facilities. For the research, the specific information such as (4) local stress regime, (5) spatial variability of petrophysical/geomechanical properties of rocks, and (6) distribution of discontinuities intersecting underground tunnels are required. The measurement system for rock mass behavior has been manufactured and set for groundwater recovery experiment in the Phase III. This report presents the results of following rock mechanical investigations conducted in FY 2014. In situ stress measurements using Compact Conical-ended Borehole Overcoring Technique were performed at the - 500m stage. Measurement system for rock massdisplacement using optical fiber was installed at the - 500m stage as part of the groundwater recovery experiment.
Matsui, Hiroya; Mikake, Shinichiro
no journal, ,
Outcome and knowledge obtained by the study on engineering technology of MIU project in fiscal 2014 year will be presented as the poster session to open a public.
Niwa, Masakazu
no journal, ,
no abstracts in English
Asamori, Koichi; Okuyama, Satoshi; Umeda, Koji
no journal, ,
no abstracts in English
Yasue, Kenichi
no journal, ,
no abstracts in English
Tanaka, Yasuharu*; Nohara, Shintaro*; Hasegawa, Takuma*; Yata, Kotaro*; Hama, Katsuhiro; Iwasaki, Riyo
no journal, ,
no abstracts in English
Mikake, Shinichiro
no journal, ,
no abstracts in English
Hama, Katsuhiro
no journal, ,
The development of modeling methodology for the mass transport in the geological environment is one of the important issues in the Mizunami Underground Research Laboratory Project. The main goal of this issue is to develop methodology for the characterization of mass transport property in the fractured crystalline rock. To achieve this goal, the study concerning mass transport phenomena in the Toki Granite should be carried out. The current status of this study has been presented.